Another site enables customers to pay high amounts in order to watch captured ISIS terrorists being tortured and subsequently murdered.

In her book, The Darkest Web: Drugs, Death And Destroyed Lives, The Inside Story Of The Internet's Evil Twin, Ms Ormbsy wrote: "There are sites that claim to sell human organs the purchaser can collect form a third-world country.

A description of the site read: "We will with official media pictures and ISIS propaganda material prove to you that we have 7 very real ISIS jihadists in our capture. Everything is live and interactive. Their fate will be in your hands.”

The site which has only been operational for a few months has already racked up hundreds of thousands of dollars.

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